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This content comes from Closed Captioning that was broadcast along with this program.

>>>we turn from tonight's news on
foreign affairs
to the shooting rampage at the
washington navy yard
and the acknowledgment today by the
u.s. secretary of defense
there were many
red flags
that were missed about the past behavior of this gunman,
aaronalexis
as the gunman's mother today broke her silence. our justice correspondent
pete williams
is with us from the d.c. newsroom with the latest on the investigation. good evening.

>> reporter: brian, good evening. more signs tonight the of the troubled mind of
aaronalexis
. investigators say he scratched two phrases in the shotgun he was carrying. quote, better off this way, and my elf weapon. an abbreviation they cannot explain. add the secretary of defense to the list of those wondering how a contractor like
aaronalexis
could get and keep a
security clearance
allowing entry to the
navy yard
after three run-ins with police and recent struggles with psychiatric problems.

>>there were
red flags
, of course there were. should we have picked them up, why didn't we, how could we? all those questions need to be answered.

>> reporter: after examining surveillance video and interviewing survivor uhs officials give this revised account of what happened inside.
alexis
enters building 197 with a shotgun in a bag and went directly to the 4th floor, ducked into a men's room and came out firing. virtually all of those hit were hit with shotgun blasts. he went back to the entrance, shot a
security guard
, took his handgun, raced upstairs and continued shooting until killed by police. investigators say they have no idea why
alexis
selected that building. they have identified no specific target of his anger.
alexis
's mother declining to appear on camera, says she has no answers either.

>>i don't know why he did what he did. i will never be able to ask him why.
aaron
is now in a place where he can no longer do harm to anyone. for that i am glad.

>> reporter: as the government looks at how to factor
mental health
issues into bkd investigations there was a note of caution.

>>men and women should have the opportunity to overcome their
mental disorders
or their mental challenges or their clinical health challenges. and shouldn't be stigmatized.

>>two patients who are here are in good condition, recovering well. we ex expect them to make excellent recoveries.

>> reporter: we know
alexis
told the newport police last month he was
hearing voices
. now the v.a. says when he later sought treatment twice he said only that he was having
trouble sleeping
. the newport police told local nay vi authorities what happened but the navy said that was never reported any further up the
chain of command
, brian.